A306382 - cp's OEIS frontend

A306382 Positive integers not representable as Pen(x) + Pen(y) + 2Pen(z), where x, y, z are nonnegative integers, and Pen(k) denotes the pentagonal number k(3k-1)/2.

n	a(n)
1	9
2	18
3	21
4	28
5	31
6	39
7	43
8	55
9	69
10	74
11	89
12	90
13	98
14	109
15	111
16	113
17	134
18	135
19	144
20	193
21	202
22	214
23	230
24	243
25	260
26	265
27	273
28	275
29	310
30	510
31	553
32	698
33	699
34	749
35	773
36	780
37	865
38	878
39	945
40	965
41	1219
42	1398
43	1413
44	2153
45	2168
46	2335
47	2828
48	3178
49	3793

[9, 18, 21, 28, 31, 39, 43, 55, 69, 74, 89, 90, 98, 109, 111, 113, 134, 135, 144, 193, 202, 214, 230, 243, 260, 265, 273, 275, 310, 510, 553, 698, 699, 749, 773, 780, 865, 878, 945, 965, 1219, 1398, 1413, 2153, 2168, 2335, 2828, 3178, 3793]

cp's OEIS Frontend

A306382 Positive integers not representable as Pen(x) + Pen(y) + 2Pen(z), where x, y, z are nonnegative integers, and Pen(k) denotes the pentagonal number k(3k-1)/2.

Table of values

List of values

cp's OEIS Frontend

A306382 Positive integers not representable as Pen(x) + Pen(y) + 2*Pen(z), where x, y, z are nonnegative integers, and Pen(k) denotes the pentagonal number k*(3k-1)/2.

Table of values

List of values

A306382 Positive integers not representable as Pen(x) + Pen(y) + 2Pen(z), where x, y, z are nonnegative integers, and Pen(k) denotes the pentagonal number k(3k-1)/2.